/*
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* Copyright 2012 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#import "ZXBinaryBitmap.h"
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#import "ZXByQuadrantReader.h"
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#import "ZXDecodeHints.h"
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#import "ZXErrors.h"
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#import "ZXResult.h"
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#import "ZXResultPoint.h"
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@interface ZXByQuadrantReader ()
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@property (nonatomic, weak, readonly) id<ZXReader> delegate;
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@end
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@implementation ZXByQuadrantReader
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- (id)initWithDelegate:(id<ZXReader>)delegate {
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if (self = [super init]) {
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_delegate = delegate;
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}
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return self;
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}
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- (ZXResult *)decode:(ZXBinaryBitmap *)image error:(NSError **)error {
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return [self decode:image hints:nil error:error];
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}
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- (ZXResult *)decode:(ZXBinaryBitmap *)image hints:(ZXDecodeHints *)hints error:(NSError **)error {
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int width = image.width;
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int height = image.height;
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int halfWidth = width / 2;
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int halfHeight = height / 2;
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// No need to call makeAbsolute as results will be relative to original top left here
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NSError *decodeError = nil;
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ZXResult *result = [self.delegate decode:[image crop:0 top:0 width:halfWidth height:halfHeight]
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hints:hints
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error:&decodeError];
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if (result) {
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return result;
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} else if (decodeError.code != ZXNotFoundError) {
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if (error) *error = decodeError;
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return nil;
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}
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decodeError = nil;
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result = [self.delegate decode:[image crop:halfWidth top:0 width:halfWidth height:halfHeight]
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hints:hints
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error:&decodeError];
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if (result) {
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[self makeAbsolute:result.resultPoints leftOffset:halfWidth topOffset:0];
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return result;
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} else if (decodeError.code != ZXNotFoundError) {
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if (error) *error = decodeError;
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return nil;
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}
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decodeError = nil;
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result = [self.delegate decode:[image crop:0 top:halfHeight width:halfWidth height:halfHeight]
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hints:hints
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error:&decodeError];
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if (result) {
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[self makeAbsolute:result.resultPoints leftOffset:0 topOffset:halfHeight];
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return result;
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} else if (decodeError.code != ZXNotFoundError) {
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if (error) *error = decodeError;
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return nil;
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}
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decodeError = nil;
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result = [self.delegate decode:[image crop:halfWidth top:halfHeight width:halfWidth height:halfHeight]
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hints:hints
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error:&decodeError];
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if (result) {
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[self makeAbsolute:result.resultPoints leftOffset:halfWidth topOffset:halfHeight];
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return result;
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} else if (decodeError.code != ZXNotFoundError) {
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if (error) *error = decodeError;
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return nil;
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}
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int quarterWidth = halfWidth / 2;
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int quarterHeight = halfHeight / 2;
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ZXBinaryBitmap *center = [image crop:quarterWidth top:quarterHeight width:halfWidth height:halfHeight];
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result = [self.delegate decode:center hints:hints error:error];
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if (result) {
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[self makeAbsolute:result.resultPoints leftOffset:quarterWidth topOffset:quarterHeight];
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}
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return result;
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}
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- (void)reset {
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[self.delegate reset];
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}
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- (void)makeAbsolute:(NSMutableArray *)points leftOffset:(int)leftOffset topOffset:(int)topOffset {
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if (points) {
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for (int i = 0; i < points.count; i++) {
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ZXResultPoint *relative = points[i];
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points[i] = [[ZXResultPoint alloc] initWithX:relative.x + leftOffset y:relative.y + topOffset];
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}
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}
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}
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@end
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